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Fix crash when aborting a stream from a I/O callback

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If a callback being invoked from a stream issues a virStreamAbort
operation, the stream data will be free'd but the callback will
then still try to use this. Delay free'ing of the stream data when
a callback is dispatching

* src/fdstream.c: Delay stream free when callback is active
This commit is contained in:
Daniel P. Berrange 2011-06-28 15:44:22 +01:00
parent c72aecc5fc
commit d97093437f
1 changed files with 23 additions and 10 deletions
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33
src/fdstream.c
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@ -56,8 +56,9 @@ struct virFDStreamData {
unsigned long long length;
int watch;
unsigned int cbRemoved;
unsigned int dispatching;
bool cbRemoved;
bool dispatching;
bool closed;
virStreamEventCallback cb;
void *opaque;
virFreeCallback ff;
@ -85,7 +86,7 @@ static int virFDStreamRemoveCallback(virStreamPtr stream)
virEventRemoveHandle(fdst->watch);
if (fdst->dispatching)
fdst->cbRemoved = 1;
fdst->cbRemoved = true;
else if (fdst->ff)
(fdst->ff)(fdst->opaque);
@ -138,6 +139,7 @@ static void virFDStreamEvent(int watch ATTRIBUTE_UNUSED,
virStreamEventCallback cb;
void *cbopaque;
virFreeCallback ff;
bool closed;
if (!fdst)
return;
@ -151,16 +153,22 @@ static void virFDStreamEvent(int watch ATTRIBUTE_UNUSED,
cb = fdst->cb;
cbopaque = fdst->opaque;
ff = fdst->ff;
fdst->dispatching = 1;
fdst->dispatching = true;
virMutexUnlock(&fdst->lock);
cb(stream, events, cbopaque);
virMutexLock(&fdst->lock);
fdst->dispatching = 0;
fdst->dispatching = false;
if (fdst->cbRemoved && ff)
(ff)(cbopaque);
closed = fdst->closed;
virMutexUnlock(&fdst->lock);
if (closed) {
virMutexDestroy(&fdst->lock);
VIR_FREE(fdst);
}
}
static int
@ -196,7 +204,7 @@ virFDStreamAddCallback(virStreamPtr st,
goto cleanup;
}
fdst->cbRemoved = 0;
fdst->cbRemoved = false;
fdst->cb = cb;
fdst->opaque = opaque;
fdst->ff = ff;
@ -252,13 +260,18 @@ virFDStreamClose(virStreamPtr st)
ret = -1;
}
virCommandFree(fdst->cmd);
fdst->cmd = NULL;
}
st->privateData = NULL;
virMutexUnlock(&fdst->lock);
virMutexDestroy(&fdst->lock);
VIR_FREE(fdst);
if (fdst->dispatching) {
fdst->closed = true;
virMutexUnlock(&fdst->lock);
} else {
virMutexUnlock(&fdst->lock);
virMutexDestroy(&fdst->lock);
VIR_FREE(fdst);
}
return ret;
}